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Diodes Incorporated AP65450SP | Demoboard AP65450SP-EVM
4A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Overview
| Topology | Buck Converter |
| Input voltage | 12 V |
| Output 1 | 1.05 V / 4 A |
| IC revision | 2.0 |
Description
The AP65450 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TV and monitor.
The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The internal proprietary circuit enables the device to adopt both low equivalent series resistance (ESR) output capacitors, such as SP-CAP or POSCAP and ultra-low ESR ceramic capacitors.
The adaptive on-time control supports seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter load conditions. DCM allows AP65450 to maintain high efficiency at light load conditions. The AP65450 also features programmable soft-start, UVLO, OTP and OCP to protect the circuit.
This IC is available in SO-8EP package
Features
- Fixed Frequency Emulated Constant On-time Control
- Good Stability Independent of the Output Capacitor ESR
- Fast Load Transient Response
- Synchronous Rectification: 65mΩ Internal High-side Switch and
- 36mΩ Internal Low-side Switch
- Wide Input Voltage Range: 4.5V to 18V
- Output Voltage Range: 0.76V to 6V
- 4A Continuous Output Current
- 650kHz Switching Frequency
- Built-in Over Current Limit
- Built-in Thermal Shutdown Protection
- Programmable Soft-start
- Pre-biased Start-up
- Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
- Halogen and Antimony Free. “Green” Device (Note 3)
Remarks:A 1μH to 3.3μH inductor with a DC current rating of at least 25% percent higher than the maximum load current is recommended for mostapplications.
Table 2 Recommended Component SelectionRefer page no.10
Typical applications
- Consumer Electronics
- Set-Top Boxes
- Home Audio
- Gaming Consoles
- Green Electronics
- Network Systems
- Distributed power systems
- Flat Screen TV Sets and Monitors
- FPGA, DSP and ASIC Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 100 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance100 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance5 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height0.8 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 16 V(DC), 1 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 16 V(DC) | Capacitance1 µF | Capacitance±10% | Rated Voltage16 V (DC) | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor5 % | Insulation Resistance0.5 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 25 V(DC), 10 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | Capacitance10 µF | Capacitance±10% | Rated Voltage25 V (DC) | Size1210 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor5 % | Insulation Resistance0.01 GΩ | Ceramic TypeX7R Class II | Length3.2 mm | Width2.5 mm | Height2 mm | Pad Dimension0.3 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
 | WE-HCI SMT Flat Wire High Current Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | – | – | – | Size7040 | Operating Temperature -40 °C up to +150 °C | – | – | – | Length7 mm | Width6.9 mm | Height3.8 mm | – | – | Inductance1.5 µH | Performance Rated Current13.8 A | Saturation Current @ 10%4.5 A | Saturation Current @ 30%14 A | DC Resistance6.6 mΩ | Self Resonant Frequency72 MHz | MaterialSuperflux |